Some icons are not applied correctly
Some apps, as AppImage-built, Snap-built and dpkg-installed apps are hard-coded to an image extension, they do not use relative path or relative icon. They use absolute path. Other apps use misleading icon name, for example, GitHub Desktop uses the
Icon=desktop.

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For changing the Firefox icon, please read the tutorial I have already created at the repository. It is not good to name the icons in the folder scalable. The correct is to rename in the desktop files. I have already explained to Magog64.

Please read our README at Suru++ Ubuntu and Suru++ 20 repositories. The snap-built apps can not have replaced icons due to hard-coding and to the absolute path of an icon. You have to copy the desktop files of snap apps from the root folder "snapd" to your_name/.local/share/icons and open them with text editor, find Icon= and change the icon name to normal name without format or extension.

Observe that our repositories support only non-harded-coded icons.

Magog64 is not a programmer and can not offer support for this workaround, but I, as a coauthor and collaborator, can offer.